The 4 digit number combination using 0 and 9 include 0000, 9999, 0999, 0099, 0009. It also includes 0909, 9090, 9000, 9900, 9990. 0990 and 9009 are also 4 digit combinations.

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what are the 4 digit number combinations using numbers0 9

From Zebulun, Eliab the son of Helon....

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A digit is a type of symbol (a numeral symbol, such as 2 or 5) used in combinations (such as 25) to represent numbers (such as the number 25) in positional numeral system...

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